scanner lens maintenancelight source calibrationanti-reflective layerBellflower Dental Group case studyapex locator battery replacementlead apron shielding integrationlifespan of dental equipmentlab handpiece maintenancevatech preventive servicescanner chairside fixesLow-Speed Handpiece Repairspatial resolution measurementRVG sensor cable replacementx-ray compliance checkequipment troubleshooting
